Buick Nailhead Intake Manifold Exhaust Crossover Plug Kit - Fits 364, 401, 425 (1953-1966)
- Buick Nailhead Crossover Plugs Buick Nailhead Intake Manifold Exhaust Crossover Plug Kit - Fits 364, 401, 425 (1953-1966) 1953-1966 Buick 401 425 Intake Manifold Plug Kit
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Upgrade or restore your classic Buick Nailhead engine with this exhaust crossover plug kit! Designed for 364, 401, and 425 cubic inch engines from 1953 to 1966, this kit includes two plugs that block off the exhaust crossover passage in the intake manifold. Made from steel with a durable finish, they're a direct replacement for old or damaged plugs. Sold by Jurassic Classic Auto Parts, they come with a 90-day warranty and are brand new in packaging. Blocking the crossover can help reduce under-hood heat and improve performance in some builds—popular among hot rodders and restorers. Whether you're building a street machine, show car, or just keeping your Buick original, these plugs are an easy install. Part numbers 111-842/111-847 may apply. Add this small but effective part to your engine bay for better temperature management!
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